Astronomy:HD 49878

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Short description: Star in the constellation Camelopardalis
HD 49878
Location of HD 49878 (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Camelopardalis[1]
Right ascension  07h 00m 04.0372s[2]
Declination +76° 58′ 38.671″[2]
Apparent magnitude (V) +4.551[3]
Characteristics
Evolutionary stage red giant branch[2]
Spectral type K4 III[4]
B−V color index 1.399[3]
Astrometry
Radial velocity (Rv)−29.47±0.19[5] km/s
Proper motion (μ) RA: 72.948(83)[2] mas/yr
Dec.: −13.442(109)[2] mas/yr
Parallax (π)17.0753 ± 0.1093[2] mas
Distance191 ± 1 ly
(58.6 ± 0.4 pc)
Absolute magnitude (MV)0.80[1]
Details
Mass1.239±0.217[6] M☉
Radius18.68+0.34
−0.79[7] R☉
Luminosity94.2±1.5[7] L☉
Surface gravity (log g)2.11[3] cgs
Temperature4,160+91
−38[7] K
Metallicity [Fe/H]0.05[3] dex
Rotational velocity (v sin i)1.4[8] km/s
Age4.817±2.347[6] Gyr
Other designations
Tonglingxing, BD+77°266, FK5 260, GC 9073, HD 49878, HIP 33694, HR 2527, SAO 6022[9]
Database references
SIMBADdata

HD 49878, also named Tonglingxing,[10] is a single[11] star in the northern circumpolar constellation of Camelopardalis. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.55.[3] The star is located at a distance of approximately 191 light years from the Sun, as determined from its parallax.[2] It is drifting closer with a radial velocity of −29.5 km/s.[5] The star has been listed as a candidate member of the Wolf 630 moving group, but is most likely a field star.[12]

This is an aging giant star with a stellar classification of K4 III,[4] having exhausted the supply of hydrogen at its core and expanded to 19 times the Sun's radius.[7] It is roughly 5 billion years old with 1.24 times the mass of the Sun.[6] The star is radiating 94 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,160 K.[7] It is spinning slowly with a projected rotational velocity of 1.4 km/s.[8]

In Chinese astronomy, Tongling (桐陵, "Phoenix Tree Mound") is a very old star name in the Purple Forbidden Enclosure that was identified with HD 49878. It was later named Shaowei and identified with other stars, such as Alpha or Gamma Camelopardalis.[13] The IAU Working Group on Star Names approved the name Tonglingxing for HD 49878 on 22 February 2026; "xing", meaning "star", is added to differentiate it from the asteroid 12418 Tongling.[10]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Soubiran, C. et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics 515: A111, doi:10.1051/0004-6361/201014247, Bibcode: 2010A&A...515A.111S. 
  4. ↑ 4.0 4.1 Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin 51: 79, Bibcode: 1962RGOB...51...79E. 
  5. ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  6. ↑ 6.0 6.1 6.2 Dollinger, M. P. (2008), Hunting for extrasolar planets around K giants, Ludwig-Maximilians-Universität München, Bibcode: 2008PhDT.......232D, https://edoc.ub.uni-muenchen.de/9970/1/Doellinger_Michaela.pdf, retrieved 2020-01-04. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  8. ↑ 8.0 8.1 De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D. 
  9. ↑ "HD 49878". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+49878. 
  10. ↑ 10.0 10.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ McDonald, A. R. E.; Hearnshaw, J. B. (August 1983), "The Wolf 630 moving group of stars", Monthly Notices of the Royal Astronomical Society 204 (3): 841–852, doi:10.1093/mnras/204.3.841, Bibcode: 1983MNRAS.204..841M. 
  13. ↑ "Tongling (桐陵)". IAU Working Group on Star Names. https://ase.exopla.net/index.php/Tongling. 



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